Adjustable chuck



w. H. CLIFFORD.

ADJUSTABLE CHUCK. APPLICATI'ON FILED oEc.3:. 1919.

. 1,384,237, Patented July 12,1921.

Inventur a /(Ilium #ayk (mm W W) UNITED STATES ADJITSTABLE CHUCK.

T 0 all wlz am it may concern Be it known that I, lViLLIAM HUGH CLIF- ronn, (Baron Clifford of Chudleigln) a subject of the King of Great Britain and Treland, residing at 67 Madeley road, Eahng, London, W. 5, England, have invented an Improved Adjustable Chuck, of which the following is a specification.

The present invention relates to an improved adjustable chuck designed to provide convenient means whereby an article can be fixed on a lathe so as to bring any part of such article to the center of the lathe without the use of the cumbersome methods now employed of packing or strapping an article in the desired position of the face plate of a lathe.

The present invention comprises a chuck built up in three pieces, these members being slotted and bolted to each other through the slots in such a manner that the clutch or gripping members of the chuck are adjustable to any desired position in relation to each other and in relation to the lathe center.

My invention is illustrated by way of example in the accompanying drawings, in which Figure 1 shows a rear view of the back plate or face plate of the lathe.

Fig. 2 shows a side view of Fig. 1.

Fig. 3 shows a plan view of the member adapted to be bolted to the face plate.

Fig. 4.- shows a side view of Fig. 3.

F 5 shows a plan view of the member adapted to slide in the face member shown in Fig. 3.

Fig. 6 shows a side view of Fig. 5.

Fig. 7 shows an isometric view of the parts in their position for use.

Referring now to the drawings the lathe is provided with a back or face plate 1 car-.

rying a central boss 2 on its rear face adapted to be screwed on to the mandrel of the lathe. This back plate 1 is provided with parallel chamfered sides 12, and bolt holes 3 arranged on either side of its central boss. In addition to the bolt holes 3 a slot 4 is provided centrally arranged between the chamfered sides 12 above or below the boss 2. This slot 4 is adapted to receive a third bolt. Bolts are passed through the bolt holes 3 and engage in a pair of corresponding slots 5 formed in the sliding plate 6, which is provided with a chamfered channel 13 on its under side adapted to engage Specification of Letters Patent.

PALI'ENT OFFICE.

ENGLAND.

Patented Jul 12, 1921.

1 Application filed December 31, 1919. Serial No. 348,689.

over the chamfered sides 12 of the face plate when the plate. 6 is placed in position on the face plate. This plate 6 is provided with a lug 7 adapted to form one member of a clutch to grip the article to be mounted in the lathe. The position. of this plate 6 and the relation of the lug 7 forming the clutch member, to the center of the lathe can be adjusted on the face plate and retained in the desired position by loosening or tightenmg the nuts 8 of the bolts which are passed through the bolt holes 3 of the face plate. The other member of the clutch is carried by the plate 9. This plate is adapted to slide in the chamfered channel 10 formed in the plate 6 and carries a lug 11 which forms the other gripping niember'of the clutch. The adjustment of the plate 9 in said channel 10 is made by the adjusting screw 15, shown in Fig. 7. ,An elongated slot 14 is formed in the plate '9 adapted to receive the bolt which is passed through the i above mentioned slot l in the face plate. In use'the article to be operated upon can be set in any desired relation to the lathe center and then gripped between the lugs 7, 11, which form the gripping members of the chuck. The chuck can then be firmly held in the desired position by tightening the nuts of bolts carried by the face plate.

lVhat I claim is 1. A lathe chuck comprising a face plate adapted to be mounted on the mandrel of the lathe, parallel edges respectively arranged on opposite sides of said face plate, a plate adapted to engage and slide over the parallel edges of said face plate and provided with a central channel with edges parallel with the edges of said face plate when the sliding plate is in position thereon, a gripping member mounted on said plate, a plate adapted to engage and slide in said central channel, a gripping member mounted on said central channel plate and means for locking said plate to said face plate in the position to which they are set.

2. A lathe chuck comprising a. face plate adapted to be mounted on the mandrel of the lathe, chamfered edges on the sides of said face plate, a plate with a channel formed on its under side adapted to engage and slide over the chamfered edges of said face plate and provided with a central channel with chamfered edges parallel with the chamfered edges of said face plate when gripping member mounted on said plate, a plate provided with ehamfered edges adapted to engage and slide insaid central channel and a gripping member mounted on said central channel plate, and means for locking said plate to said face plate in the position to which they are set.

3. A lathe chuck comprising a face plate adapted to be mounted on the mandrel of the lathe, ehamiered edges on the sides of said face plate, a plate with a channel formed on its under side adapted to engage and slide over the chamfered edges of said face plate and provided with a central channel with chamfered edges parallel with the chamfered edges of said face plate when the sliding plate is in position thereon, a projecting lug at the closed end of said central channel adapted to form a gripping member, a plate provided with chamfered edges adapted CLIFFORD.

I to engage and slide in said, central channel and a projecting lug at the 

